@Target(value={}) @Retention(value=RUNTIME) public @interface ConstructorResult
SqlResultSetMapping
annotation to map
the SELECT clause of a SQL query to a constructor.
Applies a constructor for the target class, passing in as arguments values
from the specified columns. All columns corresponding to arguments of the
intended constructor must be specified using the columns
element of the
ConstructorResult
annotation in the same order as that of the argument
list of the constructor. Any entities returned as constructor results will be
in either the new or detached state, depending on whether a primary key is
retrieved for the constructed object.
Example:
Query q = em.createNativeQuery( "SELECT c.id, c.name, COUNT(o) as orderCount, AVG(o.price) AS avgOrder " + "FROM Customer c, Orders o " + "WHERE o.cid = c.id " + "GROUP BY c.id, c.name", "CustomerDetailsResult" );
Modifier and Type | Required Element and Description |
---|---|
ColumnResult[] |
columns
(Required) The mapping of columns in the SELECT list to the arguments of the intended constructor, in order.
|
Class |
targetClass
(Required) The class whose constructor is to be invoked.
|
public abstract Class targetClass
public abstract ColumnResult[] columns
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